# Relationship history for MSHA mine 1508405

Current hierarchy: **MAPCO Inc → Toptiki Coal Corp → Toptiki Tipple**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Taylor Rodney E → Toptiki Tipple; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Long Branch Coal Company → Toptiki Tipple; 1975-05-01 to 1978-02-23; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Rodney E → Long Branch Coal Company; 1975-05-01 to 1978-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Toptiki Coal Corp → Toptiki Tipple; 1978-02-24 to 1985-11-20; source msha-controller-operator-history
- **controller_controls_mine:** MAPCO Inc → Toptiki Tipple; 1978-02-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MAPCO Inc → Toptiki Coal Corp; 1978-02-24 to 1985-11-20; source msha-controller-operator-history
- **operator_operates_mine:** S & J Trucking Company → Toptiki Tipple; 1985-11-21 to 1986-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Fields Les → Toptiki Tipple; 1985-11-21 to 1986-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Fields Les → S & J Trucking Company; 1985-11-21 to 1986-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Toptiki Coal Corp → Toptiki Tipple; 1986-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MAPCO Inc → Toptiki Coal Corp; 1986-03-01 to current/open; source msha-controller-operator-history